Timer



vention are the provisions o Patented Feb. 19, 1924.

UNITED STILIT- I A'l'ENT OFFICE.

ERNEST VON BAMBACH, OF CHICAGO, ILLINOIS, ASSIGNUR TO HERBERT D. LAFFERTY,

. 0F OAKLAND, CALIFORNIA.

TIMER.

Application led March28, 1921. Serial lila-456,461.

To all whom. t may eminem.'

Be it ,known that I, EnNixsT Von HAM BACH, a citizenyot thelllnited States or" America, and resident of Chicago, Cook County, Illinois, have invented a certain new and useful Improvement in Timers, ot' which the following is a specification.

My invention relates to an improvement in timers and has for its object the provision of an eflicient and economical structure which is particularly adapted for use on Ford cars.

Among the features and obects of my ina timer havof insulating material in which stationary brush holders carryengage with a revolving ing a casin are mounte ing brushes which contact. I y

Other features and objects of my invention will be more readily understood by having reference to the accompanying drawings in which I have illustrated one embodiment of my invention.

Fig'. lis an end elevation looking into the timer casing.

Fig. 2 is a plan sectional view partly in elevation.

Fig. 3 isa detail sectional View showing the outer end of the casing and an engaging memlier for holding the .timer in place.

I have illustrated the timer as mounted upon the end of a shaft 5 which is usually the cam shaft of the engine. This shaft is provided with a reduced portion 6 and a threaded end 7. Mounted upon the reduced end ortion 6, there is a metallic sleeve S whicli carries upon its outer periphery a sleeve 9 of insulating material. The outer ends of these sleeves 8 and 9 are beveled or inclined, as clearly indicated in Fig. 2, to permit easy and ready assembly. Thread- A ed upon the end 7 of the shaft 5 is a nut respect to the cam 10 which engages with the metallic sleeve 8, thus holding this sleeve on the shaft Fix tending through the insulating sleeve 9 and metallic sleeve 8 is a metallic Contact 11 which is preferably threaded through the metallic sleeve 8 so as to engage with the shaft 5 which is usually grounded. In order to prevent rotation of the sleeve 8 with shaft 5, and in order to properly position this sleeve on this shaft so tha-t the Contact 11 will he in proper timed relation with the movement of' thei cam shaft, there is provided in i sleeve 8 a lonslotlQ Within 'which the head of a pin 13 engages,

a cylinfflricel hole in the cam shalt. Mounted so tofengage with the revolving contact 11 are a. plurality of stationary brush contacts 111 which are mounted in metallic brush holders 15, being spring-pressed against the surface Aof the insulating sleeve or drum 9-by the springs 16, Each of these bruslrhel'lers consist of alhollow cylindrical section in ivhichthe brush contact is mounted and a. stem 17 which projects through the insulating casing 18. being he-ld in place hy the nut 19. A suitable binding nut 20 likewise is mounted upon this stem 17 so as tov permit the electrical connection 'to be made with this stem.

The insulating casing is preferably molded out of insulating materia-l', such as bakelite, or some other hard insulating material, In order to permit the casing to he readily drawn from the mold, it is necessary that the mouth of the casing be` lared, that is the inner and outer Walls of the cylindrical portion 21 of this casing are inclined, as clearly indicated in Fig. 2. This inclination allows of su'llicient draw to permit ready vremoval of the casing from the mold. In order that the blush-holders may he heldin proper a'linemcnt in a plane at right angles to the .axis ot the cam shaft, itis necessary that ad jacent the base of these brush-holders the casing' be. provided with a section having a flat inner surface which is parallel to the axis o'l 'the cam shaft as clearly indicated at in Fig. 2. Likewise, adjacent each brushholder lthere is provided on the exterior of the casing' a boss 23 which is provided with a flat tace 24 parallel to the inner face 22. Thus the stem 17 of the brush holder passes through the casing and the nut 19 engages with the face 24 of the boss and the out-er end of the brush-holder engages with the inner face 29. of the casing so that thehrushholder is held in proper right angle relationship to the cam surface. Likewise, by reason of the casing being thickened by` the boss 23, a. firmer support is provided for the lnnsh-holder.

This boss 23 furthermore acts to space the wire terminal 32, which is inserted between the nut 19 and binding nut 20, from the upset .linge 3l which surrounds the opening in the tin'iing gear case 30 in which the timer -is mounted. In this manner all danger of Short eireuit h y the terminal striking this flange is elin'iinated. The outer end of the easing 18 is provided with a protuheranee 25 having its center portion provided n'i depression QG within which progeetion on an arm 28 i5 adapted to engage iur tno purpone, of holding this et'ingy in pmiio This arm is the usual arin employed in t e Ford nrs. when the timer is used on the Fordson tractor, then the member 29 (ser,

Fig. S), engages the outside peripher;Y et il e` notuheranee and holds the Carini@` in nr l L t, sition. In other words, this protuheranee So formed that it is capable ot' use with eitl th(l holding means employed in the Ft ears or the Fordson tractor. M; Y of this timer need no lubrication` antY z oil which accumulates in the e; 'n he detrimental to the operation of the ti l provide a drain holy 5() in the lower tion of the easing so that anyv oil will drain out of the Casing. The arm formed integrally with the cup-shaped insulatineez ing ati'ordn means tor connection with the lever Whereh)v the insulating` easing varrying, the brushes ma)v he. rotated to advaure or retard the spark.

while I have illustrated and deseiihed one embodiment ot' my invention, it will he understood that do not. wish to he limited to the exact construction shown and described, but that various changes and mmlitieatione may he made without departing troni the Spirit and intent of my invention.

Vhat I Claim as my invention i5:

l. In a timing device, a rotary shalt' ha inf;y a reduced threaded end, t reduction diameter of the Shaft, formi an annular Shoulder, a metallio sleeve litting on said reduced portion of the shaft and haring an interior longitudinal groove, a radial pin re it hindi;

tilt' of Seats hein" l ik" E iris and hruCLi-hr t g e @fate and hin in thu, and the nemainingj ort Y :nl of the rim of the easing heii `oiffard the. open side oi" the onine; a j

y of ConilnedlhruSh-holder and 'ic-,rmieaeh einhodying a rigid ineinher extendradially Iinn'ardl); and having a. I'at; r end ahiitting one ot the ln|tsl1-satts, a g ietuated hrursh carried hy each one L riffid radial members, a threadt-d 'l by meh one of these rigid ,iueznhers and extending thrtaigh t in the seats, a e i' each.

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